qlsf.h

来自「speech signal process tools」· C头文件 代码 · 共 38 行

/*
 ********************************************************************************
 *
 *  Include file for qlsf and iqlsf programs.
 *
 *  @(#)qlsf.h	1.1	10/6/87 ESI
 *
 ********************************************************************************
 */

/*
 *  Defines for indexes to power quantization tables.
 */

#define FINE		0	/* 6-bit quantization */
#define COARSE		1	/* 1.5 dB quantization */

/*
 *  Data structure for quantization table.
 */

struct qtable
{
    float enc;			/* Upper limit on encoding range */
    float dec;			/* Value to decode */
    int code;			/* Bit pattern (quantization index) */
};

/*
 *  Data structure for pointer to a table, and length of the table.
 */

struct quantable
{
    struct qtable *tab;		/* Pointer to table */
    int nval;			/* Number of entries in the table */
};